What is the secret to bleeding sure stop brakes? We have followed the directions and the valves at the brakes are open but gravity just isn't cooperating. Any help is appreciated.
Here's a recent thread with suggestions on how to bleed them: http://www.mtfca.com/discus/messages/708324/723211.html?1486562882
Tom, if you didn't bench bleed the master cylinder first, you will spend a lot of time fooling with it trying to just get fluid through the system. A new master cylinder needs to be bench bled before installing. If it is already mounted, you can still do it, but you must remove the brake line and bleed only the master cylinder. Once this is done, the master will push fluid (and air) through the lines to the calipers.
Now to bleed the calipers, the bleeder screws must be at the top, and pointed upwards. I believe, due to the mounting position of the calipers, that the bleeder screws are not at the highest point of the caliper. If this is the case, remove the calipers keeping the lines attached, and orient them so that the bleeders are at the top and pointed up. Cut some scrap plywood or make some kind of shim about the same thickness of the rotor and place them between the brake pads to keep them in place and prevent the caliper pistons from popping out.
Air always rises to the top. You can't make it come out the bottom no matter how much brake fluid you waste. Think of a water bottle in your hand. The air is at the top, and if you loosen the cap and squeeze the bottle, you will force the air out. Now turn the bottle upside down. The air is still up at the top, but the cap is on the bottom. If you loosen the cap, water will come out, but the air remains at the top.
Thanks Roger and Jeff
Instead of bleeding, it is efficient to reverse fill a brake system. that is push fluid in from the calipers to the master cylinder. This is how new systems are installed on motorcycles and probably in car manufacturing. That way you push air up to the master and out as you fill with brake fluid.
Reverse bleeding is the ticket. It will work when nothing else will.
I'm pretty sure I used a vacuum can. I remember it not being easy.